<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Initialize the database
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
function &DB($params = '', $active_record_override = FALSE) {
// Load the DB config file if a DSN string wasn't passed
  if (is_string($params) AND strpos($params, '://') === FALSE) {
    include(APPPATH.'config/database'.EXT);

    if ( ! isset($db) OR count($db) == 0) {
      show_error('No database connection settings were found in the database config file.');
    }

    if ($params != '') {
      $active_group = $params;
    }

    if ( ! isset($active_group) OR ! isset($db[$active_group])) {
      show_error('You have specified an invalid database connection group.');
    }

    $params = $db[$active_group];
  }
  elseif (is_string($params)) {

    /* parse the URL from the DSN string
     *  Database settings can be passed as discreet
     *  parameters or as a data source name in the first
     *  parameter. DSNs must have this prototype:
     *  $dsn = 'driver://username:password@hostname/database';
     */

    if (($dns = @parse_url($params)) === FALSE) {
      show_error('Invalid DB Connection String');
    }

    $params = array(
        'dbdriver'	=> $dns['scheme'],
        'hostname'	=> (isset($dns['host'])) ? rawurldecode($dns['host']) : '',
        'username'	=> (isset($dns['user'])) ? rawurldecode($dns['user']) : '',
        'password'	=> (isset($dns['pass'])) ? rawurldecode($dns['pass']) : '',
        'database'	=> (isset($dns['path'])) ? rawurldecode(substr($dns['path'], 1)) : ''
    );

    // were additional config items set?
    if (isset($dns['query'])) {
      parse_str($dns['query'], $extra);

      foreach($extra as $key => $val) {
      // booleans please
        if (strtoupper($val) == "TRUE") {
          $val = TRUE;
        }
        elseif (strtoupper($val) == "FALSE") {
          $val = FALSE;
        }

        $params[$key] = $val;
      }
    }
  }

  // No DB specified yet?  Beat them senseless...
  if ( ! isset($params['dbdriver']) OR $params['dbdriver'] == '') {
    show_error('You have not selected a database type to connect to.');
  }

  // Load the DB classes.  Note: Since the active record class is optional
  // we need to dynamically create a class that extends proper parent class
  // based on whether we're using the active record class or not.
  // Kudos to Paul for discovering this clever use of eval()

  if ($active_record_override == TRUE) {
    $active_record = TRUE;
  }

  require_once(BASEPATH.'database/DB_driver'.EXT);

  if ( ! isset($active_record) OR $active_record == TRUE) {
    require_once(BASEPATH.'database/DB_active_rec'.EXT);

    if ( ! class_exists('CI_DB')) {
      eval('class CI_DB extends CI_DB_active_record { }');
    }
  }
  else {
    if ( ! class_exists('CI_DB')) {
      eval('class CI_DB extends CI_DB_driver { }');
    }
  }

  require_once(BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_driver'.EXT);

  // Instantiate the DB adapter
  $driver = 'CI_DB_'.$params['dbdriver'].'_driver';
  $DB =& instantiate_class(new $driver($params));

  if ($DB->autoinit == TRUE) {
    $DB->initialize();
  }

  return $DB;
}



/* End of file DB.php */
/* Location: ./system/database/DB.php */